A fixed exchange rate regime is built on one simple idea: stability. Under this system, a country commits to keeping its currency at a fixed value relative to another currency or a basket of currencies. The goal is not to let the exchange rate move freely with market forces, but to manage it actively.

This topic is important because it links exchange rates, monetary policy, capital flows, and central bank actions — all frequently tested in CFA and FRM exams.

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What a Fixed Exchange Rate Really Means

In a fixed exchange rate regime, the value of a currency is pegged to a reference currency, such as the US dollar, or to a group of currencies.

The exchange rate is allowed to move only within a very narrow band. If market forces push it outside this range, the central bank intervenes to bring it back.

So the exchange rate does not adjust automatically. Policy action is required.

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How the Peg Is Maintained

To maintain a fixed exchange rate, the central bank must be willing to intervene in the foreign exchange market.

If the domestic currency faces downward pressure, the central bank sells foreign reserves and buys its own currency.
If the domestic currency faces upward pressure, it buys foreign currency and supplies domestic currency.

These actions directly affect the money supply, which is why fixed exchange rate regimes constrain monetary policy.

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Role of Foreign Exchange Reserves

Foreign exchange reserves are critical in a fixed exchange rate system.

They provide the ammunition needed for intervention. Without sufficient reserves, the central bank cannot credibly defend the peg.

Exams often test whether candidates understand that a fixed exchange rate is only as strong as the reserves backing it.

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Fixed Exchange Rate and Monetary Policy Independence

One of the biggest trade-offs under a fixed exchange rate regime is the loss of monetary policy independence.

Interest rates must often be adjusted to defend the exchange rate, even if domestic economic conditions suggest otherwise.

This trade-off appears frequently in exam questions, especially through the “impossible trinity” or “trilemma” framework.

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Fixed Exchange Rate and Capital Flows

With open capital markets, fixed exchange rates become harder to maintain.

Large capital inflows or outflows can overwhelm central bank intervention efforts. Speculative attacks often occur when markets believe a peg is unsustainable.

Understanding this vulnerability is key for exam questions on currency crises.

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Advantages of a Fixed Exchange Rate Regime

Fixed exchange rates offer several benefits:

• reduced exchange rate volatility
• greater certainty for trade and investment
• inflation discipline, especially for developing economies

These advantages explain why some countries adopt fixed regimes despite their constraints.

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Disadvantages of a Fixed Exchange Rate Regime

The costs can be significant:

• loss of monetary policy flexibility
• need for large foreign reserves
• vulnerability to speculative attacks

When economic conditions diverge from the anchor country, maintaining the peg becomes increasingly difficult.

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Fixed vs Floating Exchange Rate Regime

This comparison appears often in exams.

Fixed regimes prioritise stability.
Floating regimes prioritise flexibility.

Fixed regimes require intervention.
Floating regimes rely on market adjustment.

Knowing when each system works better is more important than memorising definitions.

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Common Student Misunderstandings

Many students assume fixed exchange rates never change. In reality, pegs can be adjusted or abandoned.

Others believe fixed regimes eliminate currency risk. They reduce volatility, but they introduce policy risk instead.

Some also forget that defending a peg directly affects domestic liquidity.

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Final Thought

A fixed exchange rate regime trades flexibility for stability. It can support trade and control inflation, but it limits monetary independence and requires strong policy credibility. For CFA and FRM preparation, focus on how fixed exchange rates are maintained, the role of reserves, and the trade-offs involved. Once these links are clear, exchange rate regime questions become far easier to reason through.